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My Tarm also came with the 72* C Termovar. I thought I read somewhere, might have been here that the boiler return should be at least 140 which would be a 60* C Termovar. I believe they make one at 60* C, but everyone I've talked to that recently bought a Tarm, got the 72* C model.
I wonder if it would be worth it to try the 60* element. It would provide quicker full opening flow to the boiler but would allow 20* cooler water temp. for protection.
Where would be a good place to order the element from?
Chuck - I'd start with Bioheat USA. I did a google search on Termovar and the first link said they come in these temperatures - 45*C, 55*C, 61*C, 72*C or 80*C. Bioheat USA may be able to tell you why they go with the 72*C model.